The temporal imbalance between the release and sequestration of forest carbon has raised a fundamental concern about the climate mitigation potential of forest biomass for energy. The potential carbon debt caused by harvest and the resulting time spans needed to reach pre\uffe2\uff80\uff90harvest carbon levels (payback) or those of a reference case (parity) have become important parameters for climate and bioenergy policy developments. The present range of analyses however varies in assumptions, regional scopes, and conclusions. Comparing these modeling efforts, we reveal that they apply different principle modeling frameworks while results are largely affected by the same parameters. The size of the carbon debt is mostly determined by the type and amount of biomass harvested and whether land\uffe2\uff80\uff90use change emissions need to be accounted for. Payback times are mainly determined by plant growth rates, i.e. the forest biome, tree species, site productivity and management. Parity times are primarily influenced by the choice and construction of the reference scenario and fossil carbon displacement efficiencies. Using small residual biomass (harvesting/processing), deadwood from highly insect\uffe2\uff80\uff90infected sites, or new plantations on highly productive or marginal land offers (almost) immediate net carbon benefits. Their eventual climate mitigation potential however is determined by the effectiveness of the fossil fuel displacement. We deem it therefore unsuitable to define political guidance by feedstock alone. Current global wood pellet production is predominantly residue based. Production increases based on low\uffe2\uff80\uff90grade stemwood are expected in regions with a downturn in the local wood product sector, highlighting the importance of accounting for regional forest carbon trends. \uffc2\uffa9 2013 Society of Chemical Industry and John Wiley & Sons, Ltd
", "keywords": ["carbon payback", "0211 other engineering and technologies", "carbon neutrality", "02 engineering and technology", "bioenergy", "15. Life on land", "7. Clean energy", "13. Climate action", "11. Sustainability", "SDG 13 - Climate Action", "0202 electrical engineering", " electronic engineering", " information engineering", "forest biomass", "carbon parity", "Temporal carbon", "carbon debt", "SDG 15 - Life on Land"]}, "links": [{"href": "https://doi.org/10.1002/bbb.1407"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biofuels%2C%20Bioproducts%20and%20Biorefining", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1002/bbb.1407", "name": "item", "description": "10.1002/bbb.1407", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1002/bbb.1407"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-04-12T00:00:00Z"}}, {"id": "10.1111/j.1757-1707.2011.01116.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:19:12Z", "type": "Journal Article", "created": "2011-09-05", "title": "Land-Use Change To Bioenergy Production In Europe: Implications For The Greenhouse Gas Balance And Soil Carbon", "description": "AbstractBioenergy from crops is expected to make a considerable contribution to climate change mitigation. However, bioenergy is not necessarily carbon neutral because emissions of CO2, N2O and CH4 during crop production may reduce or completely counterbalance CO2 savings of the substituted fossil fuels. These greenhouse gases (GHGs) need to be included into the carbon footprint calculation of different bioenergy crops under a range of soil conditions and management practices. This review compiles existing knowledge on agronomic and environmental constraints and GHG balances of the major European bioenergy crops, although it focuses on dedicated perennial crops such as Miscanthus and short rotation coppice species. Such second\uffe2\uff80\uff90generation crops account for only 3% of the current European bioenergy production, but field data suggest they emit 40% to >99% less N2O than conventional annual crops. This is a result of lower fertilizer requirements as well as a higher N\uffe2\uff80\uff90use efficiency, due to effective N\uffe2\uff80\uff90recycling. Perennial energy crops have the potential to sequester additional carbon in soil biomass if established on former cropland (0.44\uffc2\uffa0Mg soil C ha\uffe2\uff88\uff921\uffc2\uffa0yr\uffe2\uff88\uff921 for poplar and willow and 0.66\uffc2\uffa0Mg soil C ha\uffe2\uff88\uff921\uffc2\uffa0yr\uffe2\uff88\uff921 for Miscanthus). However, there was no positive or even negative effects on the C balance if energy crops are established on former grassland. Increased bioenergy production may also result in direct and indirect land\uffe2\uff80\uff90use changes with potential high C losses when native vegetation is converted to annual crops. Although dedicated perennial energy crops have a high potential to improve the GHG balance of bioenergy production, several agronomic and economic constraints still have to be overcome.
", "keywords": ["carbon footprint", "short rotation coppice", "0211 other engineering and technologies", "Miscanthus", "02 engineering and technology", "7. Clean energy", "12. Responsible consumption", "Carbon debt", "CARBON CYCLE; CARBON SEQUESTRATION; ENVIRONMENTAL EFFECTS; BIOENERGY", "Biofuel", "Land management", "0202 electrical engineering", " electronic engineering", " information engineering", "carbon debt", "2. Zero hunger", "Nitrous oxide", "nitrous oxide", "Soil organic carbon", "methane", "land management", "15. Life on land", "Carbon footprint", "soil organic carbon", "13. Climate action", "biofuel", "Short rotation coppice", "Methane"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/117133/1/117133%20j.1757-1707.2011.01116.x.pdf"}, {"href": "https://doi.org/10.1111/j.1757-1707.2011.01116.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/GCB%20Bioenergy", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/j.1757-1707.2011.01116.x", "name": "item", "description": "10.1111/j.1757-1707.2011.01116.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1757-1707.2011.01116.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2011-09-04T00:00:00Z"}}, {"id": "10.5751/es-04403-160414", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-29T16:24:22Z", "type": "Journal Article", "created": "2011-11-11", "description": "Biofuels are receiving growing negative attention. Direct and/or indirect land-use changes that result from their cultivation can cause emissions due to carbon losses in soils and biomass and could negate any eventual greenhouse gas (GHG) reduction benefit. This paper evaluates the implications of land-use change emission on the climate-change mitigation potential of different biofuel production systems in 12 case studies in six countries. We calculated carbon debts created by conversion of different land-use types, ranging from annual cropland to primary forest. We evaluated case studies using three different biofuel crops: oil palm, Jatropha, and soybean. The time needed for each biofuel production system to pay back its carbon debt was calculated based on a life-cycle assessment of the GHG reduction potentials of the system. Carbon debts range from 39 to 1743.7 Mg C02 ha-1. The oil palm case studies created the largest carbon debts (472.8-1743.7 t C02 ha-1) because most of the area expansion came at the expense of dense tropical forest. The highest debt was associated with plantation on peatland. For all cases evaluated, only soybean in Guarant\u00e3 do Norte and Alta Floresta, Brazil needed less than one human generation (30 years) to repay the initial carbon debt. Highest repayment times were found for Jatropha (76-310 years) and oil palm (59-220 years) case studies. Oil palm established in peatlands had the greatest repayment times (206-220 years). High repayment times for Jatropha resulted from the combined effects of land-cover change and low CO2 emission reduction rate. These outcomes raise serious questions about the sustainability of biofuel production. The carbon implications of conversion of (semi-)natural systems with medium to high biomass indicate that, in order to generate climate benefits, cultivation of biofuel feedstocks should be restricted to areas that already have low carbon content.", "keywords": ["2. Zero hunger", "life-cycle assessment", "Ecology", "QH301-705.5", "assessment", "carbon", "Bio-\u00e9nerg\u00e9tique", "Agriculture", "15. Life on land", "01 natural sciences", "7. Clean energy", "12. Responsible consumption", "Environnement et pollution", "repayment time", "greenhouse gas", "13. Climate action", "greenhouse gases", "11. Sustainability", "Biology (General)", "QH540-549.5", "carbon debt", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.5751/es-04403-160414"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecology%20and%20Society", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.5751/es-04403-160414", "name": "item", "description": "10.5751/es-04403-160414", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5751/es-04403-160414"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2011-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=carbon+debt&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=carbon+debt&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=carbon+debt&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=carbon+debt&offset=3", "hreflang": "en-US"}], "numberMatched": 3, "numberReturned": 3, "distributedFeatures": [], "timeStamp": "2026-05-30T10:09:17.118295Z"}